If the all world countries' first and foremost interest was to end the war, it would have been finished in one year from the beginning. If they didn't want to start it, it would probably never be so big or at all.
It is sad that some countries (and corporations) benefit from the war and intend or used to intend to support it. I wish health and love to all Syrians, but I doubt they will get it in less than 3 years.
That's why I don't trust any government of the world but actually I hate them all :(
Some especially small countries have very reliable and trustworthy government. Take Iceland, Norway or Switzerland as an example. I disagree on many things with Russian government, but I think they have the best a big federation can get.
Maybe these would be reliable as you said but I don't know much about these particular governments as far as the matter of Russian or US governments then I have no good views about both of them because they made this world like a hell for their own goals and benefits but I agree that in different issues they have different level of criminality.